Many employees are reluctant to voice their disagreements in meetings.

reluctant 是形容词，由前缀 re-（表示"反对"）和词根 luct（源自拉丁语 luctari，意为"挣扎"）组成，字面意思是"内心挣扎反对的"，引申为"不情愿的、勉强的"。